Zwitterionic Polymer Brushes Coated with Mesoporous Silica Nanoparticles as Efficient Adsorbents for Dye Removal from Aqueous Solutions

Abstract

In this study, a polymer brush derived from poly(2-(tert-butylamino)ethyl methacrylate)-coated mesoporous silica nanoparticles (PTBAEMA–SO3H@MSNPs) was successfully fabricated. The structure and morphology of PTBAEMA–SO3H@MSNPs were studied using transmission electron microscopy, Fourier-transform infrared spectroscopy, dynamic light scattering, and elemental analysis techniques. The optimal conditions for the removal of rhodamine B (Rh B) and crystal violet (CV) by PTBAEMA–SO3H@MSNPs were determined. The best adsorption efficiency was found at an Rh B concentration of 150 ppm, adsorbent amount of 10 mg, contact time of 40 min, and pH 5 and at a CV concentration of 350 ppm, contact time of 40 min, and pH 9. The adsorption equilibrium was fitted with the Langmuir, Freundlich, Temkin, and Redlich–Peterson isotherm models in both linear and nonlinear forms. Equilibrium data were best fitted with the Langmuir model, with maximum adsorption capacities of 147.78 and 343.57 mg g–1 for Rh B and CV, respectively. The adsorption of both dyes onto the PTBAEMA–SO3H@MSNP adsorbent occurred spontaneously in an exothermic manner and with increased randomness. The adsorption of Rh B and CV onto the PTBAEMA–SO3H@MSNP adsorbent followed pseudo-second-order kinetics. The findings of this study indicate that PTBAEMA–SO3H@MSNPs are highly effective in removing Rh B and CV from water samples.

Adsorption equilibrium and kinetics studies of crystal violet adsorbed by anionic polymer brush functionalized mesoporous silica nanoparticles

“…TEA (0.2 ml) and BIBB (0.15 ml) were added to the mixture and stirred at room temperature. After 16 h, the particles were collected by centrifugation and washed five times with DCM and methanol [47].…”

“…C 0 and C e represent the initial concentration and concentration at time of dye in mg.L −1 , respectively. V and m represent the volume of liquid phase in L and the amount of adsorbent in mg, respectively [47,50].…”

“…MSNPs grafted with poly(2-(tert-butylamino)ethyl methacrylate) brushes have been used to remove paracetamol from aqueous solutions, with a maximum adsorption capacity of approximately 237 mg g −1 [46]. Zwitterionic polymer brushes coated MSNPs have been applied to remove Rhodamine B (Rh B) and crystal violet (CV) from aqueous solutions, demonstrating adsorption capacities of 147.78 mg•g −1 and 343.57 mg•g −1 , respectively [47].…”

Biomimetic seaweed absorbable membrane for dye adsorption in wastewater treatment

“…19 Among them, nanoparticles have great advantages in dye adsorption because of their small size and large specific surface area. 20,21 After physical or chemical treatment, the surface area and porosity of activated carbon can be increased, thus achieving a higher dye adsorption effect. [22][23][24] Clay and minerals have strong affinity for cations and anions, which is beneficial for the adsorption of dyes.…”

Synthesis of Monodispersed Hollow Mesoporous Organosilica and Silica Nanoparticles with Controllable Shell Thickness Using Soft and Hard Templates

“…Mesoporous materials have garnered significant interest for various applications, such as catalyst support, , adsorbents, , optical materials, − and drug-delivery carriers , because of their unique properties, such as high surface areas, large pore volumes, high biocompatibility, and high biodegradability. − Hollow mesoporous organosilica (HMOS) nanoparticles are a class of mesoporous materials with organic groups between inorganic silica frameworks in the mesoporous shell and large internal cavities. , When HMOS is used as a drug-delivery carrier, large amounts of drug molecules can be incorporated into its cavity. − Therefore, considerable research has focused on various applications of HMOS.…”